4921987917 has 64 divisors (see below), whose sum is σ = 8840448000. Its totient is φ = 2406378240.

The previous prime is 4921987877. The next prime is 4921987933. The reversal of 4921987917 is 7197891294.

It is not a de Polignac number, because 4921987917 - 2⁸ = 4921987661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4921987817) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 179634 + ... + 205212.

It is an arithmetic number, because the mean of its divisors is an integer number (138132000).

Almost surely, 2^4921987917 is an apocalyptic number.

It is an amenable number.

4921987917 is a deficient number, since it is larger than the sum of its proper divisors (3918460083).

4921987917 is a wasteful number, since it uses less digits than its factorization.

4921987917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25631 (or 25617 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 57.

The square root of 4921987917 is about 70156.8807530666. The cubic root of 4921987917 is about 1701.0360371034.

The spelling of 4921987917 in words is "four billion, nine hundred twenty-one million, nine hundred eighty-seven thousand, nine hundred seventeen".